Geared hoist



April 21, 1936. R PORTER 2,038,196

GEARED HOIST Filed A ril 15, 1955 3 Sheets-Sheet 2 R FPPOfQZ j 21, 1936. F. P. P RTER 2,038,196

GEARED HOIST Filed April 15, 1955 3 Sheets-Sheet 3 PP Porter,

Patented Apr. 21 1936 i (UNITED STATES GEARED HOIST Fred P.'Porter, Kellogg, Idaho, .as si gnor tb Co eu r 'DAlene Hardware & Foundry Company, Wallace, Idaho, a corporation of Idaho ApplicationApril 15, 193.5, Serial No."16,473

4' Claims.

Thiszinvention relates to improvementsin the classof pushing .and pulling implements, andits objects are as.fol1ows:-

First, to provide a hoist which includes a single ,hoisting drum with a pair of integral, thickened end .flanges, eachof which has .acoracting brake mechanism, .andone of whichhas .an internal gear capable of operation by drive means.

Second, to providea hoist in Whichthedriven ,gear, .whether internalor external, the two;end flanges and the hoisting drum are an integral .-.structure, either actuallyor functionally, so as to .reduce the-drum to theutmost simplicityas'well as to insure its absolute ruggedness and .dur-

ability, both end flanges being thickened soas to enable theiruse as braking surfaces in orderto further the desired simplicity.

Third, to confine the support of the hoisting drum to roller or other bearings which run on .races attached to a shaft which is made ..Sta- .tionary by virtue of being securedto a pairof end plates, the removal of the end plates from the ound tiona th re o e..s af r o the end plates enabling an almost immediate separation of the hoisting drum from the rest .of the mechanism. 7 s v V 7 Fourth, to provide a hoist which is confined to so few major parts that it is capable of ready transportation into regions which would be in- ,penetrable and totally inaccessible to similar con- ;trivances of a more complexnature. I

Fifth, to utilize the foregoing hoisting drum for the purpose of a duplex braking system, there being an independent brake for each of the thickened flanges, one being foot-operated for periodical stopping of the drum asin service, the other being hand-operated and of a construction ,to enable permanent locking of the drum in a stopped position, the details of the braking sysite m be ing claimed in a division of this appliatipnfiled by Fred P. Porter, March 3, 1936 ria .NQ- 6 9.

Sixth to provide a unitary hoist which is self- ,containedbecauseof the fac-t that everyelement .of thezhoisthas common support ontheibedplate, the major ones of said elements beingreadily gseparated fromthe bedplate .for piece-meal transpgrtationtovirtually inaccessible places.

In ,the 1 drawings Figure l is a side elevation of the improved gea e ho t. Figure 2 is a cross section taken .on the line ;2'.-: o i ur .1.

Figure '3 .is a -.section.taken on .the line .3-3 v Figure 15 is a cross section taken onthe line 75 -5.-*5.of Figure.4.

In working out the. details of the instant geared :hoist sight has not .been .lost of the fact that various types and constructions-of hoists are in current. .use forevery conceivable purpose to which a hoistmay be put. Butithaslbeenfound that there .is an actual need for a hoist which is capable of being disassembled and transported .into virtuallyinaccessible places,..and there. setup .for operation. Such places comprise mines, .mountainregions and a large variety of cramped positions in construction works ingeneral. With theforegoinglpurposes in minditis aparamount consideration to,,condense the structural elements to the narrowestpossible.confines Without sacrificinganyof the advantages which one could expect of a piece of mechanism of much larger and .morecomplicated proportions. I 7

Reference is made to the 'drawings. Provision -is made of a suitable bedplate generally desigated I,. This comprises what is known as fabri- ,cated strncturalsteel, or a castingof which the sideand cross angles 2, 3 are only the mainjparts. ;I n practice this bedplate will be braced either with a lattice Work of bars or an arrangement 1 vof rods which will establish a firm foundation, and yet one of oonsiderable lightness in proportion to its size because of its open-work construction. This bedplate can be mounted on skids if desired. It carries the entire hoist mechanism. r

The power plant comprises an electric or other motor-4, This is either mounted on anindepend ent platform 5 (Fig. 1) or directly upon the bed- ;plate i, -as conditionsinay require. The shaft :6 of the rno-torprojectsinto thecase I (Fig. 3) ,of areduction unit 8 which contains a train of gearing 9 respectively on the drive shaft 6 and a drivenshaft ID for the purpose of revolving .the hoistdrurn at a low rate as compared with means as screw ,studs 15. (Fig. 3). A cover l6 is fitted upon the case 7 and over the studs to which it is secured by nuts which are threaded upon the screw ends of the studs.

Both the case i and its cover plate 16 carry suitable bearings (Fig. 3) for the shaft In. These bearings are of such a type that the shaft It] will still be adequately supported upon the case 1 and end plate [2 in the event of the removal of the cover plate [6 and the respective .bearing. Such a removal will occur when disassembling the hoist for transportation.

The end plate 13 is secured to an end cross angle 3 (Fig. 5) by bolts ll, or equivalent means which will firmly hold the end plate but enable disassemblage upon requirement. Each of the end plates l2, l3 has a hole IS in its upper part to receive the reduced ends i9 (Figs. 3 and 5) or" the stationary drum shaft 26. The reductions I9 are only one of a pair of reductions at each end of the shaft, the others, which are larger than 19, being designated 2|. These reductions, considered in the order described, form shoulders 22, 23. The reduced ends l9 are threaded at their extremities so that heavy nuts can be screwed on and driven hard against the end plates l2, l3. This sets the end plates firmly against the shoulders 22, and not only holds the shaft 20 stationary but completes an absolutely rigid brace for the hoist drum.

This drum is generally designated 25. It includes a pair of thickened end flanges individually designated 26, 21. These are integral with the drum, either actually or functionally. This means that in small sizes of the hoist the flanges and hub part of the drum will be cast in one piece. In larger sizes the drum and flanges will comprise a fabricated steel construction, that is to say a construction consisting of sections which can be bolted together and unbolted. When they are bolted together the drum constitutes an integral construction as far as function is concerned.

The purpose of thickening each of the two flanges is to utilize the peripheries or outer faces as brake seats. One end of the drum is hollowed out (Fig. 3) so as to provide for an internal gear 28. The teeth of this gear are either out directly in the drum, or the gear may comprise a ring gear which is set in the hollowed end and permanently secured therein. The pinion ll meshes with the internal gear, and it is by this means that the drum 25 is driven.

As the drum is driven it revolves on bearings 29 (Figs. 3 and 5). These bearings are interposed between the stationary shaft 20 and drum 25 in any desired manner, and they may comprise either the roller bearings shown or bearings of other types. The inner races 36 on which these bearings run are mounted on the shaft, while the outer races 3| are mounted in recesses 32 in the drum ends. Plates 33 are removably affixed to the drum by means 34 for the triple purpose of retaining the bearings, keeping out dirt and insuring the centralization of the drum 25 on the stationary shaft.

As seen in Figures 3 and 5 the plates 33 are slipped onto the reductions 2| until they almost abut the shoulders 23. In practice there is only enough clearance to prevent binding, and actually there is scarcely perceptible end motion of the drum 25 on the stationary shaft 20 because of the substantial engagement of the plates 33 with the shoulders 23. The drum 25 is therefore kept in the desired central position on the shaft 20, and prevented both from binding against the pinon II and from possibly disordering the operation of the duplex brakes.

These brakes comprise pairs of brake posts 35 (Fig. 2) and 36 (Fig. 4). They are arcuate in shape so as to conform to the end flanges 26, 21 with which they coact. The brake posts have shoes or linings 31 which are engageable with the brake seats, and these linings are capable of replacement when worn. In practice the brake posts are made of fabricated steel. This construction is suggested by the webbing 38 (Fig. 1). The purpose of this construction, as already brought out, is lightness without sacrifice of strength. The Web construction is preferable for another reason, namely that the upstanding sides 39, 4 (Fig. 1) of the brake posts can be utilized to house certain essential elements of the operating mechanism.

As concerns the brake posts 35, this mechanism consists of a bellcrank 4| (Fig. 2) which is pivoted between one pair of sides as at 42, and has its remaining pivot 43 connected with an adjustable link 44 which extends across to the companion post between the upstanding sides 39 of which it is pivoted as at 45. The free end of the bellcrank 4| has one end of a rod 46 connected to it, the other end of said rod being pivoted to a pedal 41 which enables the service operation of the brake 35.

By service operation is meant a periodical operation as occurs in stopping and starting. The pedal 45 is pivoted to the bedplate at 48. A spring 49, seated between a stop 50 on the rod 46, and a bracket 5| on the bedplate tends to hold the brake 35 in its released position. The brake is operated against the tension of the spring, and when foot pressure is removed from the pedal the brake automatically assumes its released position.

As concerns the brake posts 36 (Fig. 4) the previously mentioned mechanism consists of blocks 52 which are swivelled at 53 between the upstanding sides 46. These blocks have right and left hand threaded bores which contain the corresponding threads 54, 55 of a brake shaft 56. This shaft carries a handwheel 51, or its equivalent, for the purpose of using hand power to permanently set the brakes 36 upon desiring to fixedly hold the brake drum 25 for any considerable period.

At this point it is desired to state that it is within the province of the invention to equip the pedal 45 (Fig. 2) with a dog of any known type so that it too can be permanently held if desired. However, the showing of the dog is omitted because it is important herein to preserve the distinction between the two brake mechanisms; the one coacting with the brake flange 26 being of a temporary service character, the one coacting with the brake flange 21 being of a more permanent or locking character. It is desired to state, further, that when the hoist is manufactured in such large sizes that man power cannot be entrusted to working the two braking mechanisms, the pedal 41 and handwheel 51 are intended to be replaced with power-actuated means.

Reverting to the brake posts 35, 36, shouldered bolts 58 (Fig. 1) are used for pivotal mounts. These bolts pass through the end plates l2, l3, and are held in place by nuts 59 on the outside. Brake equalizers can be used in connection with each pair of posts 35, 36, but a brakeequalizer is shown only in connection with the posts 36 (Fig.

4). This equalizer comprises a disc 60, or its equivalent, which is turnably mounted at 6| on the end plate l3. At diametrically opposite points this disc has pivot connections 62 for links 63 which extend in opposite directions to places of pivotal connection 64 with the posts 36. As these posts are turned on their pivots 58 the equalizers 60, 63 insure their turning an equal amount, thereby preventing the brake linings 31 from dragging or rubbing on the brake seats.

It is thought that the operation of the hoist is readily understood from the previous description and from an inspection of the drawings. In lieu of a detailed description of the operation it is desired to outline the manner of disassembling the hoist. The nuts 24 are removed from each end of the drum shaft 2|]. The left end plate I3 is unbolted at I! from the bed plate I, and then removed with its attached brake posts 36 and equalizer fill. The drum 25 and its drum shaft assemblage 20 is taken off. The motor 4 is removed, and with it the cover plate IS, the nuts from the screw studs l5 having previously been taken off. The large gear of the train of gearing 9 together with the shaft l remain in place on the end plate [2 and in the case 1. Next remove the brake posts 35 from the right end plate l2, and remove the pedal 41 and bracket (Fig. 2) so that the brake posts 35 are clear of the mechanism. Upon removal of the right end plate 12 with its attached reduction unit case I the disassemblage of the hoist is complete. The several parts can readily be transported to any place which would be inaccessible to the hoist as a Whole.

I claim:

1. A readily assembled and disassembled portable hoist of unitary construction comprising a drum which has a pair of integral, thickened end flanges providing brake seats, one end of the drum being hollowed, separate brake mechanisms coacting with the respective brake seats, one being for service use the other being arranged to lock the drum, a gear located in the hollow of the drum for compactness, a drum shaft and bearing means revolubly supporting the drum on the shaft, a pair of end plates and means by which the shaft is rigidly secured to said plates so as to be stationary, a power plant, a speed reduction unit between the power plant and drum and means by which said unit is attached to one of the end plates, said unit including a pinion in mesh with the internal gear, and a bedplate providing a common support for all elements recited, there being means removably securing the end plates,

brake mechanisms and power plant to the bedplate.

2. A hoist comprising a bedplate, a pair of end plates, means securing the end plates to the bedplate in spaced relationship, said means being separable so that the end plates can be taken down for a piece-meal transporation of the hoist, a speed reduction unit comprising a case and a train of gearing which includes a pinion, means securing the reduction unit to one of the end plates, and a motor to drive the train of gearing, said part of said reduction unit and respective end plate being kept together when removed from the bedplate, a drum shaft and means by which it is affixedto the end plates so as to preserve their spacing and to brace them, a drum and bearings for it on said shaft, said drum having two thickened flanges providing brake surfaces, a gear on the drum in mesh with the pinion for the driving of the drum, duplex brake mechanisms comprising pairs of posts, means by which the posts are mounted on the respective end plates, opening and closing means for one pair of posts and means extending from said means to a pedal carried by the bedplate for intermittent service operation, and means to open and close the other pair of posts, said means being adapted to lock said posts in a fixed braking position.

3. Ina hoist, a bedplate, a pair of end plates, means securing the end plates to the bedplate in spaced, upstanding positions, a drum shaft and means by which it is secured to the end plates in a spanning position to hold the shaft stationary and to brace the end plates, a drum, bearings by which the drum is revolubly mounted on the stationary shaft, and means to simultaneously retain the bearings in the drum and to coact with the shaft in substantially preventing end motion of the drum on the shaft.

4. In a hoist, a bedplate, a pair of end plates, means securing the end plates to the bedplate in spaced, upstanding positions, a drum shaft which has two diametrical reductions at each end forming two shoulders at each end, the outermost shoulder abutting the end plates, means drawing said shoulders tightly against the end plates to hold the shaft stationary and to brace the end plates, a drum, bearings by which the drum is revolubly mounted on the shaft, and plates fitted upon the remaining reductions and being secured to the drum so as to come close to the remaining shoulders, thereby substantially preventing end movement of the drum and at the same time retaining the bearings.

FRED P. PORTER. 

